Desalination of sea water by akadama soil and akadama soil-inorganic adsorbents mixtures
2006
Asaoka, S.(Meijo Univ., Nagoya (Japan). Faculty of Agriculture) | Aono, M.
The purpose of this study is to investigate utilization of Akadama soil and evaluate its ion removal efficiency for seawater desalination. The chemical composition of the Akadama soil was Al2O3 0.334 kg kg-l SiO2 0.470 kg kg-1, Fe2O3 15.7 kg kg-1 by weight. X-ray powder diffraction pattern, electron diffraction pattern and IR spectrum of Akadama soil showed that allophane was the main phase and low crystallinity kaolin was generated from the allophane. The column method was carried out to evaluate seawater desalination efficiency, the best mixture ratio of the Akadama soil (particle size was less than 250 mum), aluminum silicate adsorbent, aluminum magnesium adsorbent, and magnesium oxide adsorbent was 3: l: l: l. Removal percentages of Na+, Mg2+, Ca2+, K+ and Cl- from artificial seawater were 87.7, 84.4, 91.1, 97.3 and 90.7%, respectively. In the batch method, where the mixed adsorbent was used for removal of heavy metals from 20 mg L-1 solution, the removal percentages of Cu2+, Ni2+, Mn2+, Zn2+, Cd2+ and Pb2+ were higher than 98%. The removal percentage of PO4 from river water was 100%.
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